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Diffstat (limited to 'arch/arm/mach-uniphier/include/mach/debug-uart.S')
-rw-r--r--arch/arm/mach-uniphier/include/mach/debug-uart.S24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/include/mach/debug-uart.S b/arch/arm/mach-uniphier/include/mach/debug-uart.S
new file mode 100644
index 0000000000..af55feed04
--- /dev/null
+++ b/arch/arm/mach-uniphier/include/mach/debug-uart.S
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/serial_reg.h>
+
+#if !defined(CONFIG_DEBUG_SEMIHOSTING)
+#include CONFIG_DEBUG_LL_INCLUDE
+#endif
+
+#define BAUDRATE 115200
+#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d))
+#define DIVISOR DIV_ROUND(UART_CLK, 16 * BAUDRATE)
+
+ .macro init_debug_uart, ra, rb, rc
+ addruart \ra, \rb, \rc
+ mov \rb, #UART_LCR_WLEN8
+ strb \rb, [\ra, #0x11]
+ ldr \rb, =DIVISOR
+ str \rb, [\ra, #0x24]
+ .endm
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